Sullivan's body was discovered near the town of Dobercane, about 35 miles east of the provincial capital Pristina. An investigation was under way.

Sullivan, a liaison officer, is survived by his wife and three children, Bush said. A memorial ceremony was scheduled for Wednesday at Camp Monteith, another U.S. camp in eastern Kosovo.

About 3,000 U.S. troops are serving with the international peacekeeping force in Kosovo, which came under NATO and U.N. control after the alliance launched an air war in 1999 to stop a Serbian military crackdown on ethnic Albanians.